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 Hi, Kirk, 
  
For what you posted from TS, all you need 
is: 
  
Chg = C-Ref(C,-1);
Plot (Chg, "Change", colorBlue, styleLine); 
  
No need for a loop.  BTW, the ROC indicator 
returns the percentage rate of change (see the help file).  The above 
returns the net change.   
  
Peace and Justice   ---   
Patrick 
  ----- Original Message -----  
  
  
  Sent: Friday, June 10, 2005 3:50 PM 
  Subject: [amibroker] simple code 
  question 
  
  I have had Amibroker for awhile now but continued to use 
  TradeStation  because that is what I have been used to and it worked for 
  most of  what I needed.  I decided to dust off Amibroker and see what 
  it can  do but I am having a coding problem.  I want to plot a simple 
   indicator that measures change.  
  In TS, the formula is a 
  relatively simple:
  Chg = Close - Close[1]; Plot1(Chg);
  In 
  Amibroker what I have is:
  for( i = 1; i < BarCount; i++ 
  ) { Chg =  Close[ BarCount - 1 ] - Close[ BarCount - 2 
  ]; } Plot (Chg, "Change", colorBlue, styleLine);
  The problem is 
  that the indicator's value is correct on the last bar  of the chart, but it 
  plots that same value on every bar preceding it,  so all that results is a 
  straight line.  I tried it with the Plot  statement inside the For 
  loop but then all I get is a straight line  with many instances of the same 
  value (obviously due to the loop).
  I figured I could work it out from 
  the code for Rate of Change, but  that is simply coded with the 'ROC' 
  function, and the code for the  functions are not available to my 
  knowledge. 
  Any help is appreciated, thanks.  
  
 
 
 
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